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Trico

Trico

Family: Tricorythodidae

Genus: Tricorythodes

Life Cycle: incomplete

Three Life Stages: egg, nymph, adult cycle which includes 2 phases: dun and spinner

Emergence: July-October

Crawler Mayfly Group

Nymph

Body Description

Eyes: 2 small

Legs: 6

Wings: dark wing pads

Tails: 3

Mobility: incapable of swimming, wiggle and undulate to emerge

Lives in silt, weedy, slower sections of streams

Dun

Body Description

Abdomen: short and stubby

Eyes: 2 small

Legs: 6

Wings: 1 set, smoky transparent, no hind wings

Gills: triangular, nearly covering the first half of their abdomens

Tails: 2 or 3

Mobility: spends lots of time on surface film

Body Color: males are black or chocolate colored, (some may be lighter and have hint of grey or pale yellow); females have olive abdomen and dark brown thorax

Size: 3-6mm

Hook Size: 18-22 (18-20 most common)

Spinner

Body Description

Abdomen: short and stubby

Eyes: 2 small

Legs: 6

Wings: 1 set, no hind wings, plastic transparent looking

Tails: 3

Body Colors: female, olive abdomen and dark brown thorax; male, dark brown or black

Mobility: after mating on slow, weedy streams, spinner falls are intense, blanketing the surface

Size: 3-6mm

Hook Size: 18-22

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